CN-121987335-A - Ablation catheter and ablation method

Abstract

The embodiment of the application provides an ablation catheter and an ablation method, and belongs to the technical field of ablation. The ablation catheter comprises an inner catheter, an outer catheter, a first electrode, a second electrode and a displacement adjusting assembly, wherein the outer catheter is sleeved on the outer peripheral side of the inner catheter, the first electrode is arranged at the distal end of the inner catheter, the second electrode is arranged at the distal end of the outer catheter, the displacement adjusting assembly is arranged at the proximal end of the outer catheter, and the displacement adjusting assembly is used for driving the inner catheter and the outer catheter to move relatively along the axial direction so as to adjust the distance between the first electrode and the second electrode. Such an ablation catheter can improve the ablation effect and the ablation efficiency.

Inventors

• SUN JIAYUAN
• XIE FANGFANG
• Liu Shuaiyang
• YANG RUI
• TAO LIN
• FU JIAWEI

Assignees

• 融和医疗科技(浙江)有限公司
• 上海市胸科医院

Dates

Publication Date

20260508

Application Date

20260226

Claims (15)

1. 1. An ablation catheter, comprising: An inner catheter; an outer catheter sleeved on the outer peripheral side of the inner catheter; a first electrode disposed at a distal end of the inner catheter; a second electrode disposed at a distal end of the outer catheter; the displacement adjusting assembly is arranged at the proximal end of the outer catheter and used for driving the inner catheter and the outer catheter to move relatively along the axial direction so as to adjust the distance between the first electrode and the second electrode.
2. 2. The ablation catheter of claim 1, wherein the inner catheter has graduations disposed thereon for displaying a distance between the first electrode and the second electrode.
3. 3. The ablation catheter of claim 1, wherein the displacement adjustment assembly comprises a handle having a guide slot and a slider slidingly engaged with the guide slot; The sliding block is provided with a first through hole which is penetrated along the axial direction of the sliding block, the proximal end of the outer catheter is connected with the sliding block, and the proximal end of the inner catheter passes through the first through hole to be connected with the handle.
4. 4. The ablation catheter of claim 3, further comprising a co-controller disposed within the handle, the ablation catheter having a radiofrequency ablation mode, a pulsed ablation mode, and a compound ablation mode; When in the radio frequency ablation mode, the cooperative controller controls the first electrode to be in a radio frequency ablation state; In the pulse ablation mode, the cooperative controller controls the first electrode and the second electrode to be in a pulse ablation state; and in the composite ablation mode, the cooperative controller firstly controls the first electrode to be in a radio frequency ablation state, and then controls the first electrode and the second electrode to be in a pulse ablation state.
5. 5. The ablation catheter of claim 3, wherein the slider comprises a body portion and a push button portion, the push button portion protruding from an outer peripheral surface of the body portion, the first through hole penetrating the body portion.
6. 6. The ablation catheter of claim 3, wherein the peripheral wall of the slider is provided with a dampening ring for increasing friction between the slider and the groove wall of the guide groove.
7. 7. The ablation catheter of claim 3, wherein the first electrode comprises a body portion and a head end portion, one end of the body portion being connected to the distal end of the inner catheter, the other end of the body portion being detachably connected to the head end portion, the head end portion being of a hemispherical or pointed configuration.
8. 8. The ablation catheter of claim 7, wherein a first lumen is formed inside the body portion and a second lumen is formed inside the head end portion, the first lumen and the second lumen being in communication; the outer surface of the main body part is provided with a plurality of first liquid outlet holes communicated with the first inner cavity, and the outer surface of the head end part is provided with a plurality of second liquid outlet holes communicated with the second inner cavity; The ablation catheter further comprises an infusion tube, the infusion tube is arranged in the inner catheter in a penetrating mode along the axial direction of the inner catheter, the distal end of the infusion tube is connected with the main body, and the infusion tube is used for infusing liquid into the first inner cavity and the second inner cavity.
9. 9. The ablation catheter of claim 8, wherein the inner catheter is provided with a plurality of functional lumens extending axially therethrough, each of the functional lumens being independent of the other, the plurality of functional lumens including a first lumen, the infusion tube being disposed in the first lumen.
10. 10. The ablation catheter of claim 9, wherein the plurality of functional lumens further comprises a second lumen, the ablation catheter further comprises a pull wire, the pull wire is disposed through the second lumen, one end of the pull wire is connected to the distal end of the inner catheter, the other end of the pull wire is connected to a bending pulling rod on the handle, and the bending pulling rod is used for driving the pull wire to move so as to adjust the bending of the distal end of the inner catheter.
11. 11. The ablation catheter of claim 1, further comprising a temperature sensor coupled to the first electrode, the temperature sensor for monitoring an ablation temperature of the first electrode.
12. 12. The ablation catheter of claim 3, wherein the outer catheter comprises a flexible section and a support section, the flexible section is located at a distal end of the outer catheter, one end of the flexible section is connected with the second electrode, the other end of the flexible section is connected with the support section, the support section is connected with the slider, and an elastic modulus of the flexible section is smaller than an elastic modulus of the support section.
13. 13. The ablation catheter of claim 1, wherein the second electrode is of a cylindrical configuration, the second electrode including a flexible portion and first and second fixed portions on opposite sides of the flexible portion, the first fixed portion being closer to the outer catheter than the second fixed portion along an axial direction of the second electrode; The first fixing portion is connected with the distal end of the outer catheter, the elastic modulus of the flexible portion is smaller than that of the first fixing portion, and the elastic modulus of the flexible portion is smaller than that of the second fixing portion.
14. 14. The ablation catheter of claim 13, wherein the outer peripheral surface of the flexible portion is provided with a plurality of notches, the notches are distributed at intervals along the axial direction of the second electrode, and two adjacent notches are distributed at least partially in a dislocation manner along the circumferential direction of the flexible portion.
15. 15. An ablation method, the ablation method comprising: The method comprises the steps of providing an ablation catheter, wherein the ablation catheter comprises an inner catheter, an outer catheter, a first electrode, a second electrode and a displacement adjusting assembly, the outer catheter is sleeved on the outer peripheral side of the inner catheter, the first electrode is arranged at the distal end of the inner catheter, the second electrode is arranged at the distal end of the outer catheter, the displacement adjusting assembly is arranged at the proximal end of the outer catheter, and the displacement adjusting assembly is used for driving the inner catheter and the outer catheter to move relatively along the axial direction so as to adjust the interval between the first electrode and the second electrode; Moving the ablation catheter to a target position, and selecting one of a radio frequency ablation mode, a pulse ablation mode or a composite ablation mode; In the radio frequency ablation mode, the displacement adjusting assembly drives the outer catheter and the inner catheter to relatively move, the first electrode is exposed, and the first electrode is started to perform radio frequency ablation; In the pulse ablation mode, the displacement adjusting assembly drives the outer catheter and the inner catheter to relatively move, the distance between the first electrode and the second electrode is adjusted, and the first electrode and the second electrode are started to perform pulse ablation; In the composite ablation mode, exposing the first electrode, and starting the first electrode to perform radio frequency ablation; and adjusting the distance between the first electrode and the second electrode, and starting the first electrode and the second electrode to perform pulse ablation.

Description

Ablation catheter and ablation method Technical Field The application relates to the technical field of ablation, in particular to an ablation catheter and an ablation method. Background The conventional ablation technology in clinic mainly comprises radio frequency ablation and pulse ablation, wherein the radio frequency ablation generates heat energy through high-frequency current to heat tissues to cause protein deformation, and the pulse ablation destroys cell membranes through a high-intensity short-pulse electric field. For minimally invasive ablation treatment of the outer Zhou Exing nodules of the lung through bronchoscopy intervention, a single mode of radio frequency ablation or pulse ablation is generally adopted, but the single ablation mode has the problems of incomplete ablation and poor ablation effect due to limited ablation energy. Disclosure of Invention The embodiment of the application provides an ablation catheter and an ablation method, which can improve the ablation effect and the ablation efficiency. In a first aspect, an embodiment of the present application provides an ablation catheter, the ablation catheter includes an inner catheter, an outer catheter, a first electrode, a second electrode and a displacement adjustment assembly, the outer catheter is sleeved on an outer peripheral side of the inner catheter, the first electrode is disposed at a distal end of the inner catheter, the second electrode is disposed at a distal end of the outer catheter, the displacement adjustment assembly is disposed at a proximal end of the outer catheter, and the displacement adjustment assembly is used for driving the inner catheter and the outer catheter to move relatively along an axial direction so as to adjust a distance between the first electrode and the second electrode. In the scheme, the tube body of the ablation catheter is an inner catheter and an outer catheter, a first electrode is arranged at the distal end of the inner catheter, and a second electrode is arranged at the distal end of the outer catheter, namely the first electrode and the second electrode are respectively arranged at the distal ends of the inner catheter and the outer catheter, and the distance between the first electrode and the second electrode can be adjusted under the driving action of the displacement adjusting assembly, so that corresponding radio frequency and/or pulse signals can be output to the first electrode and/or the second electrode by adjusting the power-on sequence of the first electrode and the second electrode, the ablation catheter can have multiple ablation modes, the ablation modes can be switched to according to the actual conditions of an operation, and the functionality and the ablation effect of the ablation catheter are improved. And the distance between the first electrode and the second electrode can be flexibly adjusted according to the actual focus size, the ablation range is adjustable, the ablation efficiency is improved, and the precise ablation treatment is realized. In some embodiments, the inner catheter is provided with graduations for displaying the distance between the first electrode and the second electrode. In the above technical scheme, through being provided with the scale mark on the inner catheter, when the displacement adjustment subassembly adjusts the distance between first electrode and the second electrode like this, the scale mark can show the concrete distance between first electrode and the second electrode for the distance between first electrode and the second electrode can quantify, and the position of outer catheter of the regulation that the operating personnel of being convenient for can be more real-time accurate. In some embodiments, the displacement adjustment assembly comprises a handle having a guide slot and a slider slidably engaged with the guide slot, the slider having a first through-hole disposed therethrough along an axial direction thereof, the proximal end of the outer conduit being connected to the slider, the proximal end of the inner conduit being connected to the handle through the first through-hole. Among the above-mentioned technical scheme, including handle and slider through displacement adjustment subassembly, slider and guide way sliding fit, the guide way can play the effect of direction for the slip of slider, improves slider gliding stability. The sliding block is provided with a first through hole, the proximal end of the inner guide tube penetrates through the first through hole to be connected with the handle, the proximal end of the outer guide tube is connected with the sliding block, and the sliding block slides in the guide groove to drive the outer guide tube to move relative to the inner guide tube, so that the adjustment of the distance between the first electrode and the second electrode is realized. In some embodiments, the ablation catheter further comprises a co-controller disposed within the handle, the ablation c